Languages are extremely important and as you said “very beneficial”.
Don’t worry about Spanish, it will not confuse you, it will help you.
As a latin language Spanish has a Latin based grammar , so studying it will help you a lot with Latin itself and also with other latin languages you choose to learn ( like Italian, eventually French or even Portuguese- my own language)
I studied Latin daily at high school for 3 years and it helped me a lot through law school and it inclusively improved all my other language skills.
Latin is not a colloquial language, meaning it hasn’t too much direct speech. It’s mostly used in written/indirect speech and in technical denominations so i guess speaking it would not be a very doable thing. Anyway i wish you luck with you future Latin chat :)